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21 Cards in this Set
- Front
- Back
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what is the role of the cerebellum
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coordination of voluntary motor activity
muscle synergy |
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what is the role of the basal nuclei
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modulation of motor activity
regulate motor pattern output |
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what is the role of the cerebral motor cortex
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origin of volitional motor activity
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what are muscle spindles
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stretch receptors
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what are the two types of afferent fibers in reflexes
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1 alpha = dynamic movement
2 = static activity |
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what type of afferent fiber is associated with annulospiral endings
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1 alpha
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what type of afferent fiber is associated with flower spray endings
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2
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what are the two types of efferent fibers in reflexes
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A alpha = extrafusal fibers
A gamma = intrafusal fibers |
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what do alpha and gamma motor neurons innervate
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alpha = extrafusal fibers
gamma = intrafusal fibers |
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what is the nuclear bag
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a dialated portion of the spindle monitors the velocity of stretch of change of length (dynamic activity)
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what is the nuclear chain
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the elongated portion of the spindle running parallel to the nuclear bag monitors the change in length of the muscle fiber
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what is an example of a monosynaptic
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patellar tendon reflex
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what are the key components of a monosynaptic reflex
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receptor: muscles spindle
stimulus: stretch of muscle afferent: 1 alpha synapes: one by definition efferent: alpha motor neuron effector: extrafusal muscle fiber of the muscle that was streched (agonist) |
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what is reciprocal inhibition
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when a 1alpha afferent fiber stimulates an agonist alphmotorneuron while at the same time exciting an interneuron that inhibits the antogonists alphamotor neuron
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what type of reflex is the golgi tendon reflex
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inverse stretch, reflexive
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what are the key components of the golgi tendon reflex
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receptor: golgi tendon organ
stimulus: tension on muscle tendon caused by contraction of muscle afferent fiber: 1beta synapses: inhibitory interneuron to alphmotorneuron of contracting agonist muscle and excitatory interneuron to alphamotoneuron of opposing muscle antagonist efferent fiber: alphamotoneuron of antagonist effector: antagonist of muscle contracting |
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what is autogenic inhibition
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1beta fibers inhibiting the alphamotoneuron of the agonist muscle
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reciprocal excitation
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exciting the motoneuron ofthe antagonist muscle while at the same time inhibting the agonist muscle
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what is the purpose of the flexor reflex
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withdrawl
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what are the key components of the flexor reflex
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receptor: free nerve ending for pain
stimulus: pain afferent fiber: C or D pain afferents synapses: multiple, inhibitory interneurons to limb extensors of area bing stimulated, excitatory interneurons to limb flexors of area being stimulated. efferent: multiple alphamotoneurons primarily for same sided flexors and opposite sided extensors effectors: flexor musculature of same affected side and extensor musculature of opposite side |
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what happens with an extreme stimulus during an flexor reflex
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leads to excitatory activity of extensor interneurons of the opposite side
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